Camera connected with electronic flash device

ABSTRACT

Circuitry for controlling the exposure of an electronic flash device includes a light measuring circuit for receiving light from an object illuminated by an electronic flash and generating current in response thereto whereby the flash is terminated at a predetermined level. The predetermined level is adjusted by biasing means which are responsive to the diaphragm aperture setting and the film speed setting. In an alternative embodiment the predetermined level for terminating the flash is also adjusted in accordance with the indication of an exposure meter which is actuated by a second light measuring circuit.

United States Patent 1m 111 3,760,699 Tsujimoto 1 Sept. 25, 1973 1CAMERA CONNECTED WITH 3,485,154 12/1969 Yamada 95/11 R x ELECTRONICFLASH DEVICE 3,541,387 11/1970 Ackermann 315/151 [75] Inventor: KayoshiTsujimoto, Osaka, Japan [73] Assignee: Minolta Camera Kabushiki Kaisha,Primary Greiner Osaka, Japan AtwrneyWatson, Cole, Grlndle & Watson [22]Filed: June 23, 1971 A l. N .2 1 1 pp 0 55 [57] ABSTRACT [30] ForeignApplication Prioriiy Dam Circuitry for controlling the exposure of anelectronic June 23, 1970 Japan 45/5402] flash device includes a lightmeasuring circuit for re- June 26, 1970 Japan 45/55276 ceiving lightfrom an object illuminated by an electronic flash and generating currentin response thereto [52] U-S- Cl- 95/l 95/1l /1 1.5 R, whereby the flashis terminated at a predetermined 95/64 C, 95/53 E, 95/31 FS level. Thepredetermined level is adjusted by biasing [51] Int. Cl G03b 7/04, G03b9/02, G03b 19/00 means which are responsive to the diaphragm aperture 1Field of Search 5/ 1 1 1.5 R, setting and the film speed setting. In analternative em- 95/64 64 31 53 53 53 0 bodiment the predetermined levelfor terminating the C, 10 CT; 315/151 flash is also adjusted inaccordance with the indication of an exposure meter which is actuated bya second [56] References Cited light measuring circuit.

UNITED STATES PATENTS 3,461,783 8/1969 Fujii 95/10 C 10 Claims, 6Drawing Figures PYENTEB Z 3,760,699

sum 1 or a INVENTOR.

KAYOSHI TSUJIMOTO BY WATSON COLE GRINDLE & WATSON ATTORNEYS PMMEH3.760.699

' mm a or s INVENTOR.

KAYOSHI TSUJIMOTO WATSON COLE GRIN'DLE & WATSON ATTORNEYS Pmmiusm Y3.760.699

' samaurs INVENTOR.

KAYOSHI TSUJIMOTO WATSON COLE GRINDLE & WATSON ATTORNEYS PMEFEW3.760.699

I swam or 5 FIG.4

200 0 45 A5000 40o V2500 7 Y I l0 1' 7 800 M50 4 INVENTOR.

KAYOSHI TSUJIMOTO WATSON COLE GRINDLE & WATSON ATTORNEYS sum 5 or 5INVENTOR.

KAYOSHI TSUJ'IMOTO WATSON COLE GRINDLE & WATSON ATTORNEYS Pmvmmw V I3.780.699

'snmnrs' INVENTOR. KAYOSHI TS UJIMOTO WATSON'COLE GRINDLE & WATSONATTORNEYS CAMERA CONNECTED WITH ELECTRONIC FLASH DEVICE BACKGROUND OFTHE INVENTION The present invention relates to an electronic flashdevice for use with a photographic camera, and more particularly to sucha camera provided with a control circuit for controlling an electronicflash automatically by integrating the reflected light rays from anobject, in accordance with the diaphragm setting value and thesensitivity of a film used is transmitted to the control circuit.

In prior art electronic flash devices, and particularly those of theautomatic light adjusting type provided with a control circuit forcontrolling the radiation quantity of the electronic flash byintegrating the reflected light rays from an object are well known. Insuch devices, to control the flash radiation it is necessary to manuallyadjust the control element in the control circuit of the electronicflash device in accordance with the diaphragm value and the sensitivityof the film used. Therefore, if the adjustment is not made or amisadjustment is made the proper exposure for a flash photograph is notobtained.

However, the diaphragm setting and the film sensitivity are used as amatter of course in a camera provided with an electric shutter forautomatic exposure control, and are also necessary factors for adjustingand controlling the exposure in a camera. Therefore, they are availablefor controlling the radiation of a flash device.

Therefore, it is only necessary to store and transmit the requiredinformation to the electronic flash device, and then the radiationcontrol circuit is designed to use the diaphragm and the filmsensitivity settings automatically for controlling the electronic flashdevice. so that manual control is not required.

OBJECTS OF THE INVENTION One object of the present invention is toprovide a camera which transmits information relating to the diaphragmand the film sensitivity settings automatically to an automatic lightadjusting type electronic flash device.

A further object of the present invention is to provide in a camera ofthe type measuring light rays passing through an interchangeable lensfor compensating the non-uniform opening diaphragm value of aninterchangeable lens and use the film sensitivity as well as thediaphragm information to operate the flash control circuit for theelectronic flash device.

Still another object of the present invention is to provide a camerahaving an electronic shutter in which the shutter speed is automaticallycontrolled in accordance with the brightness of an object from thediaphragm setting and the film sensitivity used, in which a resistancevalue representative of the diaphragm and the film sensitivity settingsadjusts the electronic shutter control circuit and the flash controlcircuit in the electronic flash device.

The foregoing and other objects of the present invention will beapparent from the following detailed description of an embodiment inaccordance with the present invention.

SUMMARY OF THE INVENTION The present invention relates to a camera withan electronic flash device which is constructed in order to exposuremeter and is provided with a change-over member for adjusting thedifferent opening diaphragm settings effected by the interchangeablelens.

The camera is also provided with an electronic shutter by which theshutter speed is controlled in accordance with a variable resistance setby the operation mechanism in accordance with the diaphragm setting andthe film sensitivity setting, and the brightness of an object. Thediaphragm value, for controlling the electronic shutter controlcircuit,and the resistance value in accordance with the film sensitivityare transmitted to the flash control circuit in the electronic flashdevice to adjust the trigger level thereof.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showingthe essential portion of a first embodiment in accordance with thepresent invention.

FIG. 2 is an electric circuit for the embodiment of FIG. 11.

FIG. 3 is a perspective view showing the essential portion of a secondembodiment in accordance with the present invention.

FIG. 4 illustrates the relationship between the principle photographicparameters in the present invention.

FIG. 5 is a second embodiment of an electric circuit diagram inaccordance with the present invention.

FIG. 6 is a third embodiment of an electric circuit diagram inaccordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the cameramechanism of the first embodiment in accordance with the presentinvention, wherein lens 1 is mounted in the camera body so thatdiaphragm setting ring 2 is rotatable and yet so as to be immovable inthe direction of the optical axis. Diaphragm setting ring 2 sets thediaphragm value by locating index lla marked on the outside of the lensbarrel adjacent diaphragm scale 20 marked on ring 2. Coupling lug 2bprojects from diaphragm setting ring 2 and engages with riser 3a ofinterlocking member 3 on the camera body. Interlocking member 3 has acounterclockwise turning tendency from spring 4 so that riser 3a engageswith coupling lug 2b as described above, and to a point on the peripheryof interlocking member 3 one end of wire 9 is fastened.

Film sensitivity setting dial 6 is fixed to spindle 7 provided on thecamera main body and below dial 6 first pulley 8 also is fixed tospindle 7. The other end of wire 9 is fastened at a point on theperiphery of pulley 8. And, below first pulley 8 sector gear 11 havingarm lla extending in the axial direction is mounted loosely on spindle 7and has a clockwise turning tendency from a spring not shown in thedrawing. 0n the tip of arm I la second pulley 12 is rotatably mounted asshown in FIG. 1 and over pulley 12 wire 9 is spread. Additionally, belowgear-11 third pulley 13 is rotatably mounted on spindle 7 and wire 9 isalso spread over pulley l3 and fastened to interlocking member 3 asdescribed above through guide pulley 14. The above structure forms adifferential mechanism between film sensitivity setting dial 6 anddiaphragm setting ring 2. Large gear 21 meshes with rack 23a ofindication plate 23 and is mounted on rotatable central spindle 19 andgear 18 is mounted thereto to mesh with sector gear 11. Onto the lowerend of central spindle 19 movable contact piece 15 is mounted andannular resistor 16 is provided so as to be in contact with movablecontact piece 15. Fixed contact piece 17 is mounted on one portion ofresistor 16. Electrical lead wires not shown in the drawing arerespectively connected to both contacts to constitute variableresistance R. shown on the camera side C in FIG. 2.

Indication plate 23, to which distance scale indication plate 22 isfixed, is formed so as to slide to the right and left relative toviewing field frame 24 by the rotation of large gear 21 by means of aguide not shown in the drawing.

Reflector 25 is provided on the optical axis of lens 1 as shown in FIG.1, and at the positions where light rays reflected by reflector 25 areprojected, viewing field frame 24 and pentagonal prism 26 are mountedand through eyepiece 27 an object can be observed.

FIG. 2 is a diagram of the electronic flash circuit in accordance withthe present invention, wherein F indicates the flash side and Cindicates the camera side.

Main capacitor C and lighting capacitor C are parallelly connected topower source E through resistances on both sides thereof, and radiationdischarge tube 32, and second discharge tube 33 are connected to powersource E as shown; and SCR 35 is connected to power source R throughresistor R.,. Main capacitor C energizes the discharge tube, and ischarged by boosting power source E. Both terminals of capacitor C areconnected through synchro-switch S which is actuated when the shutter onthe camera side C is opened, and the primary winding of transformer 31.One terminal of the secondary winding of transformer 31 is connected totrigger electrode 32a of radiation discharge tube 32.

Photosensitive element P is connected through resistance R to the baseof transistor Tr Photosensitive element P may, or example, comprise aselenium cell or a silicon photoelectric cell which has a rapid responseto light rays. The collector of transistor Tr is connected to capacitorC and the base of transistor Tr And, the collector of transistor Tr, isconnected to the base of transistor Tr and the emitter of transistor Tr,and the emitter of transistor Tr are connected to each other. Variableresistance R on the camera side C and fixed resistance R on the flashside F are connected in series to the collector of transistor TrResistance R is connected to the collector of transistor Tr and also tothe gate of SCR 35.

Capacitor C and the primary winding of transformer 34 are connected inparallel with SCR 35 and are connected through resistance R., to powersource B. One terminal of the secondary winding of transformer 34 isconnected to trigger electrode 33a of second discharge tube 33. Seconddischarge tube 33 preferably has an impedance which is smaller than thatof radiation discharge tube 32.

FIG. 3 shows a second embodiment of the invention of the TTL typewherein the light rays passing through an interchangeable lens of theopening diaphragm are measured. Also the diaphragm setting isinterlocked to the exposure meter and the diaphragm setting is alsotransmitted to the automatic light adjusting type electronic flashdevice. The opening diaphragm setting of the interchangeable lens isarranged to be changedover by mounting the opening diaphragm change-overplate on the camera side. The same numerical designations are used forthe components that are the same as those illustrated in FIG. 1.

The diaphragm of interchangeable lens 1 is biased to be fully open andstopped down to the diaphragm setting value of preset diaphragm ring 2'during exposure. Lug 2'b of preset diaphragm ring 2' engages with riser3a of interlocking member 3. Gear 52 meshed with sector gear 11 isprovided with clutch pawl 52 to engage with clutch pawl 540 provided onlarge gear 54 and mounted loosely onto central spindle 19 and integrallyformed with opening diaphragm value indication ring 51.

Opening diaphragm setting change-over plate 53, on which index 53a isindicated, is mounted to the upper end of central spindle 19. Gear 54 ismounted to the middle portion of central spindle 19, and clutch pawl 54aof large gear 54 ordinarily engages with clutch pawl 52a of gear 52 bymeans of a spring not shown in the drawing. Opening diaphragm settingchange-over plate 53 is slidably in contact with the internalcircumference of opening diaphragm setting indication ring 51 on whichopening diaphragm scale 51a is marked. And, by pushing down openingdiaphragm setting changeover plate 53, the coupling of both gears 52, 54is disconnected and by turning opening diaphragm setting change-overplate 53, the relative position of both gears 52, 54 can be moved toindex a different opening diaphragm scale 51a upon index 530.

Movable contact piece 15 is mounted to the lower end of central spindlel9, and in the same manner as in the first embodiment, variableresistance R is formed by annulus resistance 16 and fixed contact piece17. By depressing and turning opening diaphragm setting change-overplate 53, the relative position of gears 52, 54 can be changed asdescribed above and at the same time the value of movable resistance Rcan be changed.

Pentagonal prism 26 and photoconductive element 55 are mounted formeasuring light rays passing through eye lens 27 to constitute a TTLexposure meter. And the indication of pointer 57 of exposure meter 56connected to photoconductive element 55 is effected by spindle 58thereof. Central spindle 19 is coupled mechanically by coupling member59 to the exposure meter, and the zero point position and the deflectionangle thereof are adjusted in accordance with the rotation of centralspindle 19.

Since the present invention is formed as described above, in FIG. 1 uponturning film sensitivity setting dial 6 to index scale 6a upon index 5in accordance with the film sensitivity, spindle 7 is turned, firstpulley 8 is also turned in the same direction. Because one end of wire 9is fastened to first pulley 8 and the other end is fastened tointerlocking member 3 and riser 3a of interlocking member 3 is inengagement with coupling lug 2b of diaphragm setting ring 2,interlocking member 3 is restrained in accordance with the diaphragmsetting. Thereby, a certain length of wire 9 is expanded and/orcontracted, and second pulley 12 is moved, and accordingly arm 11a ofsector gear 11 is turned.

Therefore, because of the expansion and contraction of wire 9 secondpulley 12 is moved and simultaneously therewith sector toothless gear 11is turned to rotate gear 18 meshed therewith. Indication plate 23 meshedwith large gear 21 is moved either right or left and distance scaleplate 22 is moved relative to viewing field frame 24.

And, upon turning diaphragm setting ring 2 on lens barrel l to anotherdiaphragm setting, coupling lug 2b of diaphragm setting ring 2 is inengagement with riser 3a of interlocking member 3 so that interlockingmemher 3 is turned. However, first pulley 8 is at a standstill so thatsecond pulley 12 is moved in the same manner as in the case where filmsensitivity setting dial 6 is turned as described above. Sector gear 11is turned as much as the moving portion of second pulley 12, and gear118 is meshed with sector gear 11, large gear 21 is integral with gear18 and is rotated, indication plate 23 is moved, and distance scaleplate 22 is moved relative to viewing field frame 24.

That is, distance scale plate 22 is moved in accordance with the filmsensitivity and the diaphragm setting, and the scale thereof indicatesthe distance limits for flash photography corresponding to theaforementioned settings.

The relationships described above will be explained more fully withreference to FIG. 4.

By turning film setting dial 6, index 40 of diaphragm setting plate 42is indexed with film sensitivity scale 44 (set for 100 in FIG. 4) and bymoving diaphragm value plate 42 index 41, connected to distance scaleplate 43, is indexed with diaphragm setting 45. And from the flashcontrol time 46 in connection with the film sensitivity and thediaphragm settings a certain photographic distance 47 can be obtained.In the example shown in the drawing, supposing the film sensitivity isASA I00 and the guide number of an electronic flash connected to thecamera main body is 20, and when set to a diaphragm value F2, the flashtime at a photographic distance of m is 1/1250 second. Thus, bycontrolling the flash time of the electronic flash connected to thecamera main body from l/40000 to H1 250 second, the photographicdistance corresponds to 10 to 1.82m.

And, by turning gear 18 and large gear 21, indication plate 23 is moved,and the length of annulus resistor 16 between fixed contact piece 17 andmovable contact piece undergoes a change and the film sensitivity andthe diaphragm settings are applied to variable resistance R,. Thecontrol of flash time corresponding to both settings can be effected bythe electric circuit.

Next, th control of the radiation of the flash and the the time thereofwill be explained with reference to FIG. 2. After the shutter is opened,when synchroswitch S, on the camera side C is closed, trigger electrode32a of radiation discharge tube 32 is energized by the voltage ofcapacitor C and transformer 31, and radiation discharge tube 32 istriggered while discharging main capacitor C The flash light isreflected depending upon the distance to an object, room factors, etc.from the object and received by quick response photocell P. Therefore,an electric current proportional to the light incident upon photocell Pis amplified by transistor Tr and charged by capacitor C I Therefore, inresponse to the turning of film sensitivity setting dial 6 and diaphragmring 2, movable contact piece 15 shown in FIG. 1 is rotated, and thefilm sensitivity and the diaphragm settings previously set up aretransmitted via resistor 16 to adjust the trigger level in the controlcircuit for the timing of the electronic flash.

Now, when the charging voltage of capacitor C attains the trigger levelof transistor Tr determined by variable resistance R, and fixedresistance R transistors Tr and Tr;, are made conductive, so that thetrig ger voltage is impressed onto the gate of SCR 3S and SCR 35 isenergized. Just as SCR 35 is energized capacitor C, is discharged andthe second discharge tube 33 is triggered through transformer 34, andthe remaining charge of main capacitor C is all discharged by seconddischarge tube 33. Thereby the flash from flash discharge tube 32 isinstantly terminated.

Therefore, in accordance with the film sensitivity and the diaphragmsettings, the flash time of the electronic flash can be automaticallycontrolled.

Next, in the second embodiment, in the case of measuring light rayspassing through the photographic lens, the opening diaphragm setting istransmitted to photoconductive element 55. Accordingly, the TTL exposuremeter receives the stop down setting from preset diaphragm ring 2' bymeans of diaphragm ring interlocking member 3. In such TTL photometry,therefore,

the stop down quantity from the opening diaphragm setting isinterlockedwith the exposure meter. The rotation of gear 52, therefore,depends upon the film sensitivity setting and the stop down quantityfrom the opening diaphragm setting to the diaphragm setting on presetdiaphragm ring 2, and the rotation of gear 52 is interlocked with theexposure meter of TTL. There-' fore, when the opening diaphragm settingof interchangeable lens l is different the information thereof isrequired to be transmitted to the flash side and in the secondembodiment such transmission is provided. In order to change therelative position between gear 52 and large gear 54 because of thedifference of the opening diaphragm diameter of interchangeable lens 1,upon pressing opening diaphragm setting change-over plate 53, large gear54 descends downwardly to disengage clutch pawl 54a of large gear54.from clutch pawl 52a of gear 52 and accordingly index 53a on openingdiaphragm setting change-over plate 53 can be indexed with diaphragmsetting indication ring 51. Central spindle 19 is also rotated andaccordingly variable contact piece 15 fixed to spindle 19 is also turnedso that variable resistance R, is changed in accordance with the changeof the opening diaphragm setting.

The other operations are the same as in the first embodiment so that anyfurther explanation thereof is unnecessary.

The second embodiment of a control circuit shown in FIG. 5 is formed tooperate in a camera provided with an electric shutter wherein theshutter speed is automatically controlled in accordance with thebrightness of an object, the diaphragm and the film sensitivitysettings, and wherein the diaphragm setting for regulating the electricshutter control circuit and the resistance setting in accordance withthe film sensitivity are transmitted to the flash control circuit in theelectronic flash device. The mechanical operating mechanism is similarto the embodiment shown in FIG. 1 and an operating value is establishedas the resistance of variable resistance 16 in accordance with thediaphragm and the film sensitivity settings, and the electric circuitthereof is described in detail hereinafter with reference to FIG. 5. Theflash control circuit for flash tube 32 and the discharge circuit fordischarge tube 33 extinguishing the flash are the same as in the firstembodiment shown in FIG. 2.

The flash control circuit for integrating the reflected light from anobject and emitting an output upon attaining a set level hasphotosensitive element P inserted between the base of transistor Tr, andresistance R Photosensitive element P preferably comprises a seleniumcell or a silicon photoelectric cell as in the first embodiment.

The collector of transistor Tr, is connected to capacitor C and the baseof transistor Tr,. The emitter of transistor Tr and the emitter oftransistor Tr are connected to each other and to terminal d ofchange-over switch S, for the electric shutter control circuit on thecamera side C.

Transistor Tr, and transistor Tr have common bias resistance R, insertedrespectively in the emitters thereof, and the collector of transistorTr, is connected to the base of transistor Tr, through resistance R, toconstitute a differential amplifier circuit. The base of transistor-Tr,is connected to terminal b of change-over switch S on the camera side C.

Switches S and S, on the camera side C are changed over respectivelyfrom terminal ,a to terminal b and from terminal c to terminal (1 priorto the shutter operation.

The collector of transistor Tr, is connected to fixed resistance R, andthe gate of SCR 35.

As shown in FIG. 5, the following components are connected to powersource E as follows: transistor Tr, through electromagnet M; variableresistance R, through change-over switch 8,; both transistors Tr Trthrough bias resistance R,; and photoconductive element R throughcapacitor C Transistors Tr, Tr, have their respective emitters connectedto bias resistance R,, and the collector of transistor Tr, is connectedto the base of transistor Tr,

and resistance R The base of transistor Tr, is connected to capacitor Cand' switch S, which is opened when the shutter is opened to constitutea differential amplifier circuit.

FIG. 6 shows the third embodiment of a control circuit for use in TTLtype cameras wherein the dia phragm setting is interlocked with theexposure meter for the electric shutter, and operates with the mechanismof the second embodiment shown in FIG. 3 and the formation on the flashside F in the electric circuit is the same as in the embodiment shown inFIG. 5. On the camera side C of the electric circuit, transistor Tr, isconnected to capacitor C and the collector of transistor Tr is connectedto the base of transistor Tr,. Capacitor C, and diode D are connected inparallel to the base of transistor Tr and between them there is providedswitch S, which is opened just before the shutter is opened. And, fordaylight photographing the light quantity incident upon photoconductorelement R is logarithmically compressed by diode D and the voltageacross diode D is transmitted to capacitor C,. And also, for flashphotographing switch S is changed over from contact e to contact f andto delay capacitor C,

resistance R is connected to effect the exposure for 1/30 second, whichis predetennined.

That is, for daylight photographing switches S S S, are connectedrespectively to contacts a, c, e to display the resistance of variableresistance R, and set up on variable resistance 16 shown in FIG. 3, theopening diaphragm setting of the interchangeable lens, the stop downvalue of the preset diaphragm setting, and the film sensitivity setting,so as to be stored by capacitor C The logarithmically compressed signalrepresenting the brightness of the object is transmitted to be stored bycapacitor C,. And, when the shutter is released, switch S is firstopened and then the movable mirror is turned and the diaphragm isstopped-down to a preset setting. And, just as switch S is opened thevoltage of condenser C, is transmitted by transistor Tr, to chargecapacitor C and when that voltage corresponds to the voltage stored bycapacitor C the differential amplifier circuit energizes electromagnet Mthrough transistor Tr,. And, for flash photographing switch S is changedover to contact f and capacitor C is connected to resistance R, toconstitute the delay circuit of about l/30 second. Switches 5, and S,are changed over from contacts a, c to contacts b, d respectively priorto the exposure, and the opening diaphragm setting of theinterchangeable lens, the stop down setting, and the film sensitivitysetting are transmitted to the electronic flash device throughresistance R, to control the flash thereof.

1 claim:

1. Apparatus for controlling the exposure of an electronic flash deviceand flash control circuitry for a camera, comprising:

an electrically operated shutter including a diaphragm setting ring fora lens in the camera, an

interlocking member engaging with said diaphragm setting ring, a filmsensitivity setting member, an operation mechanism connected to saidinterlocking member and said film sensitivity setting member, v

a photometric circuit including a photoconductive element for generatingan output corresponding to the brightness of an object,

an electromagnet for starting the closing of the shutter,

and a diflerential amplifier circuit for operating said electromagnetand having a variable trigger level; said flash control circuit includesa photosensitive element for receiving light rays of an object includingthe reflected light rays of the flash device,

an integrating circuit for integrating the output of said photosensitiveelement,

and a trigger circuit for extinguishing said electronic flash devicewhen the integrated value of said integrating circuit is substantiallyequal to the trigger level of said differential amplifier;

means for changing the trigger level of said differential amplifiercircuit;

means for changing the trigger level in said trigger circuit; and

means for transmitting the preset diaphragm setting and the filmsensitivity setting from said operation mechanism to said triggercircuit.

2. Apparatus for controlling the exposure of an electronic flash deviceand flash control circuitry for a camera, comprising:

a diaphragm biased to be open in an interchangeable lens of said camera;

a preset diaphragm ring for said diaphragm;

an interlocking member engaging with said preset diaphragm ring when aninterchangeable lens is mounted to the camera;

a film sensitivity setting member;

an operation mechanism connected to said film sensitivity setting memberand said interlocking member;

an exposure meter having a photosensitive element for receiving objectlight rays passing through said opening diaphragm;

a means for adjusting the indication of said exposure meter inaccordance with the movement of said operation mechanism;

an electric shutter control circuit including a photometric circuitincluding said photosensitive element, an electromagnet for starting theclosing of the shutter, and a differential amplifier circuit foroperating said electromagnet and having a variable trigger level;

means for changing the trigger level in said electric shutter inaccordance with the movement of said operation mechanism;

an integrating circuit for integrating the output of said photosensitiveelement;

said flash control circuit including a trigger circuit for extinguishingsaid electronic flash tube when the integrated value of said integratingcircuit is substantially equal to the trigger level of said differentialamplifier circuit; and

means for transmitting the preset diaphragm setting and the filmsensitivity setting from said operation mechanism to said triggercircuit.

3. A combination of a camera and an electronic flash device set forth inclaim 2, wherein said camera is provided with an operation mechanismcomprising:

a spindle supported rotatably on the camera main body;

a film sensitivity setting dial fixed to said spindle;

;a firstfixed pulley fixed to said spindle;

a second rotatable pulley supported rotatably on said spindle;

a partially toothless gear supported rotatably on said spindle andhaving an arm extending in the axial direction;

a planetary pulley supported rotatably on said arm;

a flexible string body one end of which is fastened to said first fixedpulley and the other end of which is fastened to the periphery of saidinterlocking member, being spread over said planetary pulley and secondrotatable pulley;

a sleeve provided with a gear meshed with said partially toothless gearand formed with an annulus opening diaphragm indication portion on oneend thereof and a saw-tooth shaped clutch tooth on the other endthereof;

a central spindle fitted rotatably and slidably in said sleeve andprovided on one end thereof with a disc tooth meshable with saidsaw-tooth shaped clutch tooth of said sleeve; and

a variable resistance which value is changed through the rotation ofsaid central spindle;

and a means for adjusting the indication of the exposure meter ininterlocking with the rotation of said central spindle, a means forchanging the trigger level in the electric shutter in interlocking withthe rotation of said central spindle, and a means for changing thetrigger level in the trigger circuit in said electronic flash device ininterlocking with the rotation of said central spindle.

4. Apparatus for controlling the exposure of an electronic flash deviceand flash control circuitry for a camera, comprising:

means for generating an electronic flash;

a flash control circuit including a light measuring circuit forreceiving light from an object illuminated by said means for generatingan electronic flash and for generating electric current in responsethereto, integrating means for integrating said electric current, andmeans responsive to said integrating means for terminating the flash ata predetermined level of said integrated current;

a diaphragm aperture setting member;

a film speed setting member;

biasing means for adjusting said predetermined level,

and

means for interconnecting said biasing means with said diaphragmaperture setting member and said film speed setting member so that saidbiasing means is adjusted as a function of the diaphragm aperturesetting and the film speed setting.

5. Apparatus as in claim 4, wherein said means for interconnecting saidbiasing means with said diaphragm aperture setting member and said filmspeed setting member comprises:

shaped opening diaphragm indication portion for 6 cooperating with saidannulus opening diaphragm indication portion, and a saw-tooth shapedclutch a rotatable first spindle;

a film speed setting dial and a first pulley mounted to said firstspindle;

a second pulley and a sector gear rotatably supported to said film speedsetting dial and having an arm extending radially therefrom;

a planetary pulley supported rotatably on said arm;

a rotatable second spindle;

first and second gears, a distance scale indicating member, and a memberfor adjusting said biasing means, said first gear engaging with saidsector gear; and

an interconnecting member and a flexible wire one end of which isfastened to said first pulley and the other end of which is fastened tosaid interconnecting member for interconnecting said biasing meansmeasuring circuit receptive to light from an object to be photographedand for generating electric current in accordance therewith, means forterminating exposure, and a switching circuit for actuating said meansfor terminating exposure.

7. Apparatus as in claim 6 wherein said exposurecontrol circuit furtherincludes switch means for connecting said biasing means to saidswitching circuit. 8. Apparatus as in claim 6, further comprising:

an exposure meter actuated by said second light measuring circuit; and vmeans for adjusting said means for interconnecting whereby said biasingmeans are adjusted in accordance with the indication of said exposuremeter.

9. Apparatus as in claim 8, wherein said camera has an interchangeableobjective lens attachable to the camera body, and a diaphragm having anopening tendency and said diaphragm setting member is a preset memberfor presetting diaphragm aperture settings further comprising:

an interlocking member engaging with said preset member when saidinterchangeable objective lens is attached to the camera body andwherein said switching circuit is a differential amplifier.

10. Apparatus as in claim 9 wherein said means for interconnecting saidfilm speed setting member and said diaphragm aperture setting memberwith said biasing means comprises:

a first rotatable spindle, a film speed setting dial and a first pulleymounted to said first spindle, a second to the periphery of saidinterlocking member, saidwire being spread over said planetary pulleyand said second pulley;

a sleeve having a gear engaging with said sector gear, said sleeveincluding a fully opened diaphragm scale on one end thereof and asaw-tooth shaped clutch on the other end thereof;

a second spindle mounted rotatably and slidably in said sleeve andprovided on one end thereof with an index for indicating a selecteddiaphragm setting from said scale, and a second saw-tooth shaped clutchengageable with said first saw-tooth shaped clutch;

a variable resistance adjustable by rotation of said second spindle;

means for adjusting said second spindle in accordance with theindication of said exposure meter;

means for adjusting the level of said switching circuit in the exposurecontrol circuit in accordance with the impedance of said variableresistance; and

switching means for transmitting said impedance to said flash controlcircuit for adjusting the level thereof to terminate the flash.

1. Apparatus for controlling the exposure of an electronic flash device and flash control circuitry for a camera, comprising: an electrically operated shutter including a diaphragm setting ring for a lens in the camera, an interlocking member engaging with said diaphragm setting ring, a film sensitivity setting member, an operation mechanism connected to said iNterlocking member and said film sensitivity setting member, a photometric circuit including a photoconductive element for generating an output corresponding to the brightness of an object, an electromagnet for starting the closing of the shutter, and a differential amplifier circuit for operating said electromagnet and having a variable trigger level; said flash control circuit includes a photosensitive element for receiving light rays of an object including the reflected light rays of the flash device, an integrating circuit for integrating the output of said photosensitive element, and a trigger circuit for extinguishing said electronic flash device when the integrated value of said integrating circuit is substantially equal to the trigger level of said differential amplifier; means for changing the trigger level of said differential amplifier circuit; means for changing the trigger level in said trigger circuit; and means for transmitting the preset diaphragm setting and the film sensitivity setting from said operation mechanism to said trigger circuit.
 2. Apparatus for controlling the exposure of an electronic flash device and flash control circuitry for a camera, comprising: a diaphragm biased to be open in an interchangeable lens of said camera; a preset diaphragm ring for said diaphragm; an interlocking member engaging with said preset diaphragm ring when an interchangeable lens is mounted to the camera; a film sensitivity setting member; an operation mechanism connected to said film sensitivity setting member and said interlocking member; an exposure meter having a photosensitive element for receiving object light rays passing through said opening diaphragm; a means for adjusting the indication of said exposure meter in accordance with the movement of said operation mechanism; an electric shutter control circuit including a photometric circuit including said photosensitive element, an electromagnet for starting the closing of the shutter, and a differential amplifier circuit for operating said electromagnet and having a variable trigger level; means for changing the trigger level in said electric shutter in accordance with the movement of said operation mechanism; an integrating circuit for integrating the output of said photosensitive element; said flash control circuit including a trigger circuit for extinguishing said electronic flash tube when the integrated value of said integrating circuit is substantially equal to the trigger level of said differential amplifier circuit; and means for transmitting the preset diaphragm setting and the film sensitivity setting from said operation mechanism to said trigger circuit.
 3. A combination of a camera and an electronic flash device set forth in claim 2, wherein said camera is provided with an operation mechanism comprising: a spindle supported rotatably on the camera main body; a film sensitivity setting dial fixed to said spindle; a first fixed pulley fixed to said spindle; a second rotatable pulley supported rotatably on said spindle; a partially toothless gear supported rotatably on said spindle and having an arm extending in the axial direction; a planetary pulley supported rotatably on said arm; a flexible string body one end of which is fastened to said first fixed pulley and the other end of which is fastened to the periphery of said interlocking member, being spread over said planetary pulley and second rotatable pulley; a sleeve provided with a gear meshed with said partially toothless gear and formed with an annulus opening diaphragm indication portion on one end thereof and a saw-tooth shaped clutch tooth on the other end thereof; a central spindle fitted rotatably and slidably in said sleeve and provided on one end thereof with a disc shaped opening diaphragm indication portion for cooperating with said annulus opening diaphragm indication portion, aNd a saw-tooth shaped clutch tooth meshable with said saw-tooth shaped clutch tooth of said sleeve; and a variable resistance which value is changed through the rotation of said central spindle; and a means for adjusting the indication of the exposure meter in interlocking with the rotation of said central spindle, a means for changing the trigger level in the electric shutter in interlocking with the rotation of said central spindle, and a means for changing the trigger level in the trigger circuit in said electronic flash device in interlocking with the rotation of said central spindle.
 4. Apparatus for controlling the exposure of an electronic flash device and flash control circuitry for a camera, comprising: means for generating an electronic flash; a flash control circuit including a light measuring circuit for receiving light from an object illuminated by said means for generating an electronic flash and for generating electric current in response thereto, integrating means for integrating said electric current, and means responsive to said integrating means for terminating the flash at a predetermined level of said integrated current; a diaphragm aperture setting member; a film speed setting member; biasing means for adjusting said predetermined level, and means for interconnecting said biasing means with said diaphragm aperture setting member and said film speed setting member so that said biasing means is adjusted as a function of the diaphragm aperture setting and the film speed setting.
 5. Apparatus as in claim 4, wherein said means for interconnecting said biasing means with said diaphragm aperture setting member and said film speed setting member comprises: a rotatable first spindle; a film speed setting dial and a first pulley mounted to said first spindle; a second pulley and a sector gear rotatably supported to said film speed setting dial and having an arm extending radially therefrom; a planetary pulley supported rotatably on said arm; a rotatable second spindle; first and second gears, a distance scale indicating member, and a member for adjusting said biasing means, said first gear engaging with said sector gear; and an interconnecting member and a flexible wire one end of which is fastened to said first pulley and the other end of which is fastened to said interconnecting member for interconnecting said biasing means with said diaphragm aperture setting member, said wire being spread over said planetary pulley and said second pulley.
 6. Apparatus as in claim 4 further comprising: an exposure control circuit including a second light measuring circuit receptive to light from an object to be photographed and for generating electric current in accordance therewith, means for terminating exposure, and a switching circuit for actuating said means for terminating exposure.
 7. Apparatus as in claim 6 wherein said exposure control circuit further includes switch means for connecting said biasing means to said switching circuit.
 8. Apparatus as in claim 6, further comprising: an exposure meter actuated by said second light measuring circuit; and means for adjusting said means for interconnecting whereby said biasing means are adjusted in accordance with the indication of said exposure meter.
 9. Apparatus as in claim 8, wherein said camera has an interchangeable objective lens attachable to the camera body, and a diaphragm having an opening tendency and said diaphragm setting member is a preset member for presetting diaphragm aperture settings further comprising: an interlocking member engaging with said preset member when said interchangeable objective lens is attached to the camera body and wherein said switching circuit is a differential amplifier.
 10. Apparatus as in claim 9 wherein said means for interconnecting said film speed setting member and said diaphragm aperture setting member with said biasing means comprises: a first Rotatable spindle, a film speed setting dial and a first pulley mounted to said first spindle, a second pulley and a sector gear rotatably supported on said first pulley, said sector gear having an arm extending in the radial direction; a planetary pulley supported rotatably on said arm; a flexible wire one end of which is fastened to said first pulley and the other end of which is fastened to the periphery of said interlocking member, said wire being spread over said planetary pulley and said second pulley; a sleeve having a gear engaging with said sector gear, said sleeve including a fully opened diaphragm scale on one end thereof and a saw-tooth shaped clutch on the other end thereof; a second spindle mounted rotatably and slidably in said sleeve and provided on one end thereof with an index for indicating a selected diaphragm setting from said scale, and a second saw-tooth shaped clutch engageable with said first saw-tooth shaped clutch; a variable resistance adjustable by rotation of said second spindle; means for adjusting said second spindle in accordance with the indication of said exposure meter; means for adjusting the level of said switching circuit in the exposure control circuit in accordance with the impedance of said variable resistance; and switching means for transmitting said impedance to said flash control circuit for adjusting the level thereof to terminate the flash. 